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<title>khai bao bien</title>
<script type="text/javascript">
   /* khai bao bien */
   var a=5;
   var hoten ="Nguyen Van A";
   var tinhtrang = true;
   var dtb = 6.7;
   document.write("gia tri a la:"+a);
   document.write("<br>gia tri ho ten la:"+hoten);
   document.write("<br>gia tri tinh trang la:"+tinhtrang);
   document.write("<br>gia tri diem trung binh la:"+dtb);
</script>
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